StreamlinePlot example 3

How to overlay streamlines on a stereographic map projection

This StreamlinePlot example can be created using HLU C library calls, HLU FORTRAN library calls, or NCL. It shows how to overlay streamlines on a polar stereographic map projection. The names of the source files for this example are st03c.c, st03f.f, and st03n.ncl.


This module discusses how to create this plot using HLU function calls or NCL. A resource file is included with this example, and it is called st03.res. This file is used to change the default resource settings for the plot. Some of the StreamlinePlot line resources are tweaked in the resource file to show how to change the appearance of the vectors.

A detailed discussion of how this example works appears in its source code.

Creating the plot using HLUs

The HLU C program that generates this plot is called st03c.c.

Creating the plot using HLU FORTRAN library calls

The HLU FORTRAN program that generates this plot is called st03f.f.

Creating the plot using NCL

The NCL script that generates this plot is called st03n.ncl.

The data

The data for this plot is from a netCDF file (created by NCL) called 941110_UV.cdf containing UV wind data for a series of lat/lon coordinates.

The data file is located in your NCAR Graphics data directory in a subdirectory called "cdf". You can get the name of the data directory by typing "ncargpath data" at your shell prompt. If you have netCDF installed on your system, then you can change directory to where the netCDF file resides and type "ncdump -h 941110_UV.cdf" to view the header information for this data file.

How to run this example

This example can be created using a C program (st03c.c), a FORTRAN program (st03f.f), or an NCL script (st03n.ncl). The examples are installed in the following locations:

The resource file for this example is located in:

The netCDF data file is installed in the following location:

You can copy this example and run it by typing "ng4ex st03c", "ng4ex st03f", or "ng4ex st03n". A copy of the source file and resource file will be placed in your current working directory. The source code will be compiled and automatically run for you. You must have the netCDF library installed on your system in order to compile the C or FORTRAN version of this example.

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$Revision: 1.7 $ $Date: 1999/03/23 19:00:57 $